Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
- 1Chemical Changes
State the name given to a reaction in which a substance loses electrons.
- 2Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
- 3Electrolysis
State the two materials commonly used as inert electrodes in electrolysis, and explain why they must be inert.
- 4Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
- 5Exothermic and Endothermic Reactions
Explain, in terms of the reaction pathway, why adding a catalyst increases the rate of a reaction without changing the overall energy change of the reaction.
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